Asserting a Rails controller response doesn’t contain certain content
I need to be able to assert that a response from a Rails controller doesn’t contain certain content, for example when the same action will respond to both GET and POST methods. In my case I’m writing a register method in a LoginController and I want it to render the same view, but if the registration was successful I do not want the registration form to be displayed again and instead want some text that answers the question, “Ok, I’ve registered, what next?”
Turns out this is easy (I should have known). I found the answer on this Cheat Sheet. The assert_select test helper accepts an equality? parameter, so give it false and it ensures that the content does not contain the value specified in the selector parameter.
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